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Related Experiment Videos

Novel substrate specificity engineered in the arabinose binding protein

N Declerck1, J Abelson

  • 1Laboratoire de Génétique, Institut National Agronomique Paris-Grignon, France.

Protein Engineering
|August 1, 1994
PubMed
Summary

Researchers modified the L-arabinose binding protein (ABP) to alter its sugar-binding specificity. Mutating specific amino acids created variants that bind modified galactose molecules instead of natural sugars.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Engineering

Background:

  • The L-arabinose binding protein (ABP) from Escherichia coli exhibits high affinity for L-arabinose and D-galactose.
  • ABP displays stringent specificity requirements at positions 1, 2, 3, and 4 of the pyranose ring, with reduced affinity for sugars differing only at the C5 position.

Purpose of the Study:

  • To engineer the binding pocket of ABP to shift specificity towards C1-substituted galactosides.
  • To create steric space near the reducing end of bound galactose by mutating specific residues.

Main Methods:

  • High-resolution crystallography of the ligand-protein complex.
  • Site-directed mutagenesis of four key residues (Lys10, Asp90, Thr147, Leu145) to smaller side chains.
  • Fluorometric analysis of 47 mutant proteins for binding affinity to methyl-beta-D-galactoside (met-beta-Gal) and isopropyl-beta-D-thiogalactoside (IPTG).

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Main Results:

  • Two double-residue mutants (Ser147/Ala90 and Ser147/Gly90) demonstrated selective binding to met-beta-Gal and IPTG, respectively.
  • These mutants no longer bound galactose, indicating a successful shift in specificity.
  • Fluorescence and molecular modeling suggested similar binding modes for new substrates to mutant proteins as natural ligands to wild-type ABP.

Conclusions:

  • Protein engineering of ABP can successfully alter sugar-binding specificity.
  • Mutations creating space in the binding pocket enable recognition of C1-substituted galactosides.
  • The modified ABPs offer potential for applications requiring specific carbohydrate recognition.